Getting correctly signed SSL Certificates for cPanel/WHM Services

Back in the day I set up a few VPSes with WHM/cPanel on to host some sites. As back then the certificates for the cPanel services (FTPD, SMTP, WHM, …) were self-signed and Let’s Encrypt was still in its early days, I also ordered a wildcard certificate for *.3rds.be along with that and configured WHM …